JAMES HANLON wrote:
Excellent. Would that same .28 wavelength value carry for all bands or
specific to a single band?
Yes, the same 0.28 wavelength value carries over for all bands. That's a
number that I "eye-balled" from figure 18A on page 24 of the book that I
recommended to you.
...
From my ARRL Handbook, the length (feet) of a half-wave in space is
492/Freq (mHz) . In words, that's 492 divided by the frequency in
megahertz. The book goes on to say that the actual length of a half-wave
antenna will be shorter, depending upon the diameter of the wire used and
because of the capacitive loading effect of the end insulators. They
suggest using Length (feet) = 468/Freq(mHz) for wire antennas at
frequencies up to 30 mHz. Remember that is the length for a HALF
wavelength. You have to double that to get a full wavelength.
Depending on whether you use 468 or 492 to calculate the length,
muliplied by 2, then divided by .28 a 40 meter .28 wavelengths antenna
comes out pretty close to 40 feet.
I will have to try this out later this week.
Thanks!
jason
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